Well I think I'm going to take the GTA out of commission for a little bit. I went to start to take my plugs out and my damn rachet broke on me....my only 3/8s too........Oh well, I'm going to go out and get a bunch of tools anyway so it dont matter.

Actually the reason I'm typing this is to get some input. While I'm taking my plugs out and checking em' I think I'm going to pull my runners and maybe my plenum and port em' out as well as install my new MSD box and coil. Does anyone have any tips as how to go about porting the TPI out???? I dont believe its very hard, but then again I have no expierence doing it. Also is there anything else you guys can think of that I should do while I have all of this taken apart. I was thinking an AFPR, 160 stat, maybe a new throttle body.............????????

Right now I'm have a totally stock L98 thats running 14.3s 14.4s pretty consistantly, and I would like to get her into the mid 13s (13.5 - 13.7) without doing any internal engine work. I know with the mods that I'm getting ready to do I'm taking a step in the right direction, but I definately would like to hear from some of you that have been there and back.

FYI, I'm going to be getting my cable for my laptop, so I will be able to scan and hopefully maybe do some burning as well, but I havent dug into the inforation that much yet.

Thanks

------------------
j.wolfe
_ ____ _
91 GTA L98
Best time: 14.389@95.49 (VIR)
"...Deception..." Brandon Sloan * ...wounds heal and chics dig scars...

[This message has been edited by poorboy8 (edited August 10, 2001).]

 

160* stat is a no no. I personally run faster with a warmer T-stat. As for porting the TPI out.... Search the tech/general board. Vader has a neat little adobe acrobat file that shows pictures and everything. Man...14.3 and you haven't ported the plenum? should definitly be in the 13's after the plenum alone...If not very very close.

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

I don't think that porting the plenum alone will net 13s, but with all the things your planning you should be there. good luck

------------------
'88 RS (originally 2.8)
-350, .040 over, vette alum. L98s, stock tpi.
-305 injectors & chip
-TES headers & edelbrock cat back
-3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
on a 2.050 60 ft.
(Damn the 2.8!)

 

I have an L98 with headers edelbrock intake, AS&M Runners ported plenum and other mods and my best is a 14.030@98 with a 2.1 60*

 

Dont wanna dis my MAF but those speed density cars seem to be tearing it up!

 

With your MSD ignition add a coil,cap/rotor,and wires...attack it as a whole..the stock ignition is a joke.
I did this combo on my 305 TPI ..it feels MUCH better up top!!

Turn yor timing up to 12 degrees or so...
Get a fuel pressure regulator..set to about 48 psi..

With the plenum,grind down the walls that are right behind the throttle body openings....also any obstructions around the runner openings...foil,and air filter with that.

I have a 160 stat on my 88 305 ..it works fine....I had heat in the winter,and it goes into closed loop with no problem.

BTW....that is a very impressive time for that car.
If it was a formula,I bet it would go 14.2's-14.1 stock.

 

Speed Density cars run a tad stronger than MAF cars from the factory but are a little less forgiving when it comes to cam changes and such.

 

I wouldn't recomend getting an AFPR, the stock setting is good enough unless you are doing major engine work, same thing for the new TB, and a good 180* thermostat works great. In addition to the new ignition parts and free mods, I would suggest doing complete exhaust system. Headers, high flow cat (or no cat if you can), and cat-back system. You can do all that for under $700 and it will get your car well into the 13s. You can also do all that work in a few hours in your garage.

------------------
1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

check my sig

------------------
1988 IROC-Z L98
License Plate: STG KLR 1
Engine Mods:
Edlebrock TES Headers, Hypertech Chip, Flowmaster Muffler, Intake Airfoil, Removed MAF Screens, MSD-6A, MSD Blaster 2 GM Coil, bored .030 over.
Nitrous System:
NOS Plate Kit, 100hp shot.
Suspension Mods:
Lakewood Traction Action Lift Bars, Hal Rear Shocks
Trans Mods:
2,500 stall converter, Redline clutches,Heavy Duty Steels, Trans-Go reprograming kit , Heavy Duty 2-4 band, Corvette Servo, B&M Mega Shifter
ET: 13.833@99.30 N/A

"If you can put it on your car, its fair" Quote By Guido
Foundering Member of the Illinois Overkill Crew (IOC)
www.mfba.org

 

A few hours in the garage eh Dan87?
You must have like 10 arms and a very cool work ethic. It took me an afernoon just to do the cat-back.
I'd shoot to get it done in one weekend, headers will suck a whole day down.

------------------
'88 RS (originally 2.8)
-350, .040 over, vette alum. L98s, stock tpi.
-305 injectors & chip
-TES headers & edelbrock cat back
-3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
on a 2.050 60 ft.
(Damn the 2.8!)

 

Well my MSD 6A and Coil should be in this morning, yay!

Ok, I have a pretty good hesitiation when there is a big load on the engine or when the Tq converter is locked up in OD when I'm cruisin' down the highway and I give it a little juice. I know its not the tranny cause the rpms arnt picking up when its hesitating, so I'm almost sure its the worn out ignition system. I checked a few of the plugs and didnt notice anything out of the ordinary except that they looked a little white, but nothing too bad. What I was going to do is put the coil and box on it and see if the hesitation goes away. If it doesnt go away them I will just go ahead and start with checking all of the plugs and then move to the plug wires (although those are pretty new MSDs). Do you see this as being the proper way to go about fixing the problem, or what would you do different? Also if I get new plugs, what would you recommend?

------------------
j.wolfe
_ ____ _
91 GTA L98
Best time: 14.389@95.49 (VIR)
"...Deception..." Brandon Sloan * ...wounds heal and chics dig scars...

[This message has been edited by poorboy8 (edited August 13, 2001).]

 

SLP HEADERS & Y pipe from group purchase
NO CAT
Hooker catback (AESOME QUALITY, i just got mine)

ported plenum
ported SLP runners
ported manifold
ported heads id get ported 305 heads if you got a 350 cause their 58CC compared to your 64cc..... also, ported 305 heads flow exceptionally well to! but with this you will be in the LOW LOW LOW LOW 13's.